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Summary: Ctors | Methods | Inherited Methods

# ConnectivityManager.NetworkCallback

`public static class ConnectivityManager.NetworkCallback`
`extends Object` ``

java.lang.Object
↳ | android.net.ConnectivityManager.NetworkCallback

Base class for `NetworkRequest` callbacks. Used for notifications about network changes. Should be extended by applications wanting notifications. A `NetworkCallback` is registered by calling `ConnectivityManager.requestNetwork(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback)`, `ConnectivityManager.registerNetworkCallback(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback)`, or `ConnectivityManager.registerDefaultNetworkCallback(android.net.ConnectivityManager.NetworkCallback)`. A `NetworkCallback` is unregistered by calling `ConnectivityManager.unregisterNetworkCallback(android.net.ConnectivityManager.NetworkCallback)`. A `NetworkCallback` should be registered at most once at any time. A `NetworkCallback` that has been unregistered can be registered again.

## Summary

### Public constructors
`NetworkCallback()`

### Public methods
`void` | `onAvailable(Network network)` Called when the framework connects and has declared a new network ready for use.
`void` | `onBlockedStatusChanged(Network network, boolean blocked)` Called when access to the specified network is blocked or unblocked.
`void` | `onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities)` Called when the network corresponding to this request changes capabilities but still satisfies the requested criteria.
`void` | `onLinkPropertiesChanged(Network network, LinkProperties linkProperties)` Called when the network corresponding to this request changes `LinkProperties`.
`void` | `onLosing(Network network, int maxMsToLive)` Called when the network is about to be lost, typically because there are no outstanding requests left for it.
`void` | `onLost(Network network)` Called when a network disconnects or otherwise no longer satisfies this request or callback.
`void` | `onUnavailable()` Called if no network is found within the timeout time specified in `ConnectivityManager.requestNetwork(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback, int)` call or if the requested network request cannot be fulfilled (whether or not a timeout was specified).

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### NetworkCallback

    public NetworkCallback ()

## Public methods

### onAvailable

    public void onAvailable (Network network)

Called when the framework connects and has declared a new network ready for use.

For callbacks registered with `ConnectivityManager.registerNetworkCallback(NetworkRequest, PendingIntent)`, multiple networks may be available at the same time, and onAvailable will be called for each of these as they appear.

For callbacks registered with `ConnectivityManager.requestNetwork(NetworkRequest, PendingIntent)` and `ConnectivityManager.registerDefaultNetworkCallback(ConnectivityManager.NetworkCallback)`, this means the network passed as an argument is the new best network for this request and is now tracked by this callback ; this callback will no longer receive method calls about other networks that may have been passed to this method previously. The previously-best network may have disconnected, or it may still be around and the newly-best network may simply be better.

Starting with `Build.VERSION_CODES.O`, this will always immediately be followed by a call to `onCapabilitiesChanged(android.net.Network, android.net.NetworkCapabilities)` then by a call to `onLinkPropertiesChanged(android.net.Network, android.net.LinkProperties)`, and a call to `onBlockedStatusChanged(android.net.Network, boolean)`.

Do NOT call `ConnectivityManager.getNetworkCapabilities(android.net.Network)` or `ConnectivityManager.getLinkProperties(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions (there is no guarantee the objects returned by these methods will be current). Instead, wait for a call to `onCapabilitiesChanged(android.net.Network, android.net.NetworkCapabilities)` and `onLinkPropertiesChanged(android.net.Network, android.net.LinkProperties)` whose arguments are guaranteed to be well-ordered with respect to other callbacks.

Parameters
`network` | `Network`: The `Network` of the satisfying network. This value cannot be `null`.

### onBlockedStatusChanged

    public void onBlockedStatusChanged (Network network,
                    boolean blocked)

Called when access to the specified network is blocked or unblocked.

Do NOT call `ConnectivityManager.getNetworkCapabilities(android.net.Network)` or `ConnectivityManager.getLinkProperties(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions : calling these methods while in a callback may return an outdated or even a null object.

Parameters
`network` | `Network`: The `Network` whose blocked status has changed. This value cannot be `null`.
`blocked` | `boolean`: The blocked status of this `Network`.

### onCapabilitiesChanged

    public void onCapabilitiesChanged (Network network,
                    NetworkCapabilities networkCapabilities)

Called when the network corresponding to this request changes capabilities but still satisfies the requested criteria.

Starting with `Build.VERSION_CODES.O` this method is guaranteed to be called immediately after `onAvailable(Network)`.

Do NOT call `ConnectivityManager.getLinkProperties(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions : calling these methods while in a callback may return an outdated or even a null object.

Parameters
`network` | `Network`: The `Network` whose capabilities have changed. This value cannot be `null`.
`networkCapabilities` | `NetworkCapabilities`: The new `NetworkCapabilities` for this network. This value cannot be `null`.

### onLinkPropertiesChanged

    public void onLinkPropertiesChanged (Network network,
                    LinkProperties linkProperties)

Called when the network corresponding to this request changes `LinkProperties`.

Starting with `Build.VERSION_CODES.O` this method is guaranteed to be called immediately after `onAvailable(Network)`.

Do NOT call `ConnectivityManager.getNetworkCapabilities(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions : calling these methods while in a callback may return an outdated or even a null object.

Parameters
`network` | `Network`: The `Network` whose link properties have changed. This value cannot be `null`.
`linkProperties` | `LinkProperties`: The new `LinkProperties` for this network. This value cannot be `null`.

### onLosing

    public void onLosing (Network network,
                    int maxMsToLive)

Called when the network is about to be lost, typically because there are no outstanding requests left for it. This may be paired with a `NetworkCallback#onAvailable` call with the new replacement network for graceful handover. This method is not guaranteed to be called before `NetworkCallback#onLost` is called, for example in case a network is suddenly disconnected.

Do NOT call `ConnectivityManager.getNetworkCapabilities(android.net.Network)` or `ConnectivityManager.getLinkProperties(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions ; calling these methods while in a callback may return an outdated or even a null object.

Parameters
`network` | `Network`: The `Network` that is about to be lost. This value cannot be `null`.
`maxMsToLive` | `int`: The time in milliseconds the system intends to keep the network connected for graceful handover; note that the network may still suffer a hard loss at any time.

### onLost

    public void onLost (Network network)

Called when a network disconnects or otherwise no longer satisfies this request or callback.

If the callback was registered with requestNetwork() or registerDefaultNetworkCallback(), it will only be invoked against the last network returned by onAvailable() when that network is lost and no other network satisfies the criteria of the request.

If the callback was registered with registerNetworkCallback() it will be called for each network which no longer satisfies the criteria of the callback.

Do NOT call `ConnectivityManager.getNetworkCapabilities(android.net.Network)` or `ConnectivityManager.getLinkProperties(android.net.Network)` or other synchronous ConnectivityManager methods in this callback as this is prone to race conditions ; calling these methods while in a callback may return an outdated or even a null object.

Parameters
`network` | `Network`: The `Network` lost. This value cannot be `null`.

### onUnavailable

    public void onUnavailable ()

Called if no network is found within the timeout time specified in `ConnectivityManager.requestNetwork(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback, int)` call or if the requested network request cannot be fulfilled (whether or not a timeout was specified). When this callback is invoked the associated `NetworkRequest` will have already been removed and released, as if `ConnectivityManager.unregisterNetworkCallback(android.net.ConnectivityManager.NetworkCallback)` had been called.

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